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[Daily Question] Divided into three major sections: Refrigeration basics, system equipment selection plan, refrigeration equipment maintenance [Reward rules] 1-3 credits will be awarded to all commentators in this post. Answers are 10-15, valid for two days, and the answers will be published in two days. Refrigeration basics section - pressure enthalpy diagram - refrigeration calculation (3) 1. Overview The calculation of pressure enthalpy diagram will be used in refrigeration calculations, such as the selection of throttle valve, you need to know the flow rate of the refrigerant, the selection of evaporative cooling needs to know the heat rejection, etc. Introduce several basic pressure-enthalpy diagram calculation terms 1. Refrigeration capacity per unit mass KJ/KG 2. Refrigeration capacity per unit volume KJ/M2 3. Refrigerant mass flow rate KG/H 4. Refrigerant volume flow rate M2/H 5. Unit condensation heat load KJ/KG 6. Unit theoretical compression work KJ/KG 7. Refrigeration coefficient COP The above 7 parameter refrigeration calculations will be mentioned in the following daily question. Question 1: Please look at the picture below. Please use the H1, H2, H3 and H4 formulas to express the unit theoretical compression work (KJ/KG) (prompt to use the enthalpy difference to express) ============================== Premium Promotion: Moving equipment---Daily questions about value and function in the direction of refrigeration https://bbs.hcbbs.com/thread-2848974-1-1.html Moving equipment---screw refrigeration compressor manufacturer internal training materials https://bbs.hcbbs.com/thread-2850090-1-1.html